Vacuum-pump.



31G-ll SR P13 8502 OR 1sz-298w564 L. W. CHUBB.

VACUUM PUMP.

APPLICATION FILED ml. I8. 1915.-

1,298,664. Patented Apr. 1, 1919.

INVENTOR v l V Lew/ls n! (/zubb 0616 z l ATTORNEY UNITED STATES PATENT OFFICE.

LEWIS W. CHUBB, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

VACUUM-PUMP.

Specification of Letters Patent.

Patented Apr. 1, 1919.

T 0 all whom it may concern:

Be it known that I, LEWIS W. CHU BB, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvanla, have mvented a new and useful Improvement in Vacuum-Pumps, of which the following is a specification.

My invention relates to apparatus for moving electrically conducting l1qu1ds, and it has special reference to fluid pumps and to ejectors of the type in which gases or liquids are transferred by the fluid-entangling efl'ect of a stream of liquidpassmg at relative] high velocity from a jet.

One object of my invention is to provide apparatus for moving bodies of electrically conductin liquids by means of the magnetic pulling e ect of a moving magnetic field.

Another object of my invention 1s to provide an efiicient and rapidly-operating pump of the above-indicated character which shall be simple in construction and which shall embody means for employing, as the e ector fluid, a stream of mercury or other conducting liquid, together with means for magnetically moving the stream of liquid.

One embodiment of my invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal vlew, partially in elevation and partially in section, showing a pump constructed in accordance with my invention, the section being taken substantiall along the line II in Fig. 2, and Fig. 2 IS an end elevational view of the pump shown in Fig. 1, as seen from the ri ht of Fig. 1.

y invention is based upon the fact that mercury and other conducting liquids may be set in motion by the dragging eflect of a moving magnetic field. In the modification shown in the drawing, I provide means for inducing a rotating magnetic field, and I provide a helical passage for liquid in the rotating field together with means for supplying mercury or other conducting liquid to the helical tube. The liquid is caused to circulate through the helical tube, at considerable velocity, by the electromagnetic drag of the revolving field and, while in motion, it is conducted to a device for utihzmg its kinetic energy. For example, it may be caused to pass through the jet of an ejector nnected to the fluid to be pumped.

'4 g a I, o i 4.

Referring to the drawing, the pump therein shown comprises two concentric laminated cores 1 and 2, similar to the primarv and secondary cores of an induction motor.

Either or both of these laminated cores may be provided with 4 so as to field in t polyphase windings 3 and produce a revolving magnetic 11w gap between them. The two wmdmgs are s e c 1 other that the fluxes produced *bv thenraie additive. by a helical tube which may conveniently be constructed of two concentric shells 5 and 6 between which is a helically-wound partition 7. The parts 5 and 6 should be made of non-conducting material which is non-magnetic and which will not amalgamate, while the part 7 should be of conducting material which is non-magnetic. An alloy of about 30% nickel and iron is suitable for the helical partition 7. One end of the tube formed by the shells 5 and 6 and the partit1on 7 18 connected to an inlet pipe 8 the lower end of which is immersed in a bath of mercury 9 contained in a vessel 10. The other end of the tube is similarly connected to a discharge pipe 11, the free end of which is also immersed in the mercury 9 and is flared as shown at 12. An ejector 13 is disposed m the pipe 11 near its flared outlet end 12, and a tube 14 connects the ejector 13 to a source of fluid 15, such as a chamber to be evacuated.

In the operation of my device, the helical tube and the vessel 10 are filled with mercury to form a closed circulating system. when current is supplied to the polyphase windings 3 and 4, a rotating magnetic field is induced which causes the mercury to circulate through the helical tube at a velocity suificient to draw fluid from the chamber 1:1 according to the well known ejector principle. The mercury carrying the entrapped fluid is discharged at the flared outlet 12 and the fluid ejected with the mercury will rise to the surface of the mercury bath 9. The mercury will remain to be circulated again by entrance into the inlet tube 8.

My device is well adapted for use as a vacuum pump, in which case the chamber 15 represents a space to be evacuated, but it is also adapted for use in pumping from atmospheric pressure to some higher pressure, as in injector devices for supplying water The annular air gap is occupied 35 and an ejector adapted to be operated by the and other fluids. In this case, the entire device should be inclosed in the high-pressure space or in a separate chamber maintained at corresponding pressure, and the tube 14:

is connected to a source of fluid supply. The

circulating mercury will serve to draw the water or other fluid from the source of supply and deliver it to the inclosing vessel. On account of their non-miscibility, the water and mercury are readily separated by gravity.

The device which I'have shown and described, and which employs a rotating magnetic field, may be modified by substltuting other devices which induce moving fields that are adapted to impart movement to a body of mercury or other magnetic liquid. One such device is a developed polyphase solenoid having a sliding field. It may also be convenient to equip a single pumping device, having either a sliding or rotating field, with several ejector devices to multiply the pumping efiect of the machine. It is to be understood that my invention comprehends these modifications and all others that fall within the scope of the appended claims.

I claim as my invention:

1. A fluid pump comprising means dependent upon a rotating magnetic field for imparting movement to an electricallyconducting liquid and an ejector adapted to be operated by the said liquid.

2. A fluid pump comprising means dependent upon a rotating magnetic field for imparting movement to a body of mercury, and an ejectoradapted to'be operated by the said mercury. g

3. A fluid pump comprising means for producing a moving magnetic field, means for subjecting .an electrically conducting liquid to the dragging efl'ect of the said moving field and thereby moving the said liquid,

said moving liquid.

4. A fluid pump comprising means for producing a moving magneticfield, means for sub ecting a body of mercury to the Gopibs of this patent may be obtained for five cents 5. The combination with means for pro- I ducing a revolvin magnetic field, of a helical tube dispose in the said field, and means for introducing an electrically conducting liquid into the-said tube, whereby the said liquid is caused to traverse the said tube by the dragging eifect of the said revolving field. f.

6. The combination with means for inducing a revolving magnetic field comprising spaced concentric primary and secondary cores, of two concentric tubes of electrically non-conducting material disposed in the space between the said cores, a helical partition disposed between the said tubes and forming a helical passage, and means for introducing a liquid into the said passage.

7. The combination with means for inducing a revolving magnetic field comprising spaced concentric prima and secondary cores, of two concentric tu s of electrically non-conducting material disposed in the space between the said cores, a helical partition of non-magnetic electrically-conductingmaterial disposed between the said tubes and'forming a helical passage, and means for introducing an electrically conducting liquid into the said passage.

8. The combination with a closed system adapted to contain an electrically conducting liquid, of magnetic means dependent upon a rotating ma etic field for circulating the said liquid in the said system, and means for utilizing the kinetic energy of the said liquid.

In testimony whereof, I have hereunto subscribed my name this 15th,day of Jan. 1915;,

LEWIS w. CHUBB.

Witnesses:

O. W. A. On'rrme, B. B. Hnms.

each, by addressing the "commissioner of Iatents,

- Washington, D. O. 

